Abstract
This paper concerns dynamic characteristics of a feed drive system with the nonlinear spring behavior. The dynamic characteristics during the microscopic motion can be represented with a mixed term by combining Coulomb friction and the nonlinear spring behavior. Comparing experiment results with simulation results, it can be found that the dynamic characteristics are dominated by the Coulomb friction term in the range of 1OOμm and over, and described by the mixed term in the range of 5〜100μm. It is clarified that the effect of Coulomb friction on the mixed term is excessively strengthened when the Coulomb frictional coefficient is used in the range of 1OOμm and over.
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